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Tick-Tack
Asked:2020-11-09 00:29:28 +0000 UTC2020-11-09 00:29:28 +0000 UTC

如何确定用户点击了哪个按钮

  • 772

因此，屏幕上有 5 个按钮，您需要确定用户单击了哪个按钮并获取其标签，然后重定向到另一个活动。试图这样做：

protected override void OnCreate(Bundle savedInstanceState)
{
    base.OnCreate(savedInstanceState);

    SetTheme(Android.Resource.Style.ThemeDeviceDefaultLightNoActionBar);
    SetContentView(Resource.Layout.MainScreen);

    Button BtnHm = (Button)FindViewById(Resource.Id.Home);
    BtnHm.Click += SwitchActivity;

    Button BtnSrch = (Button)FindViewById(Resource.Id.Search);
    BtnSrch.Click += SwitchActivity;

    Button BtnLstOfPh = (Button)FindViewById(Resource.Id.ListOfPhotos);
    BtnLstOfPh.Click += SwitchActivity;

    Button BtnGlr = (Button)FindViewById(Resource.Id.Glory);
    BtnGlr.Click += SwitchActivity;

    Button BtnMyAcc = (Button)FindViewById(Resource.Id.MyAcc);
    BtnMyAcc.Click += SwitchActivity;
}

public void SwitchActivity(object sender, EventArgs e)
{
    Button sendBtn = (Button)sender;

    switch (sendBtn.Tag)
    {
        case 1:
            Intent toMain = new Intent(this, typeof(MainScreenActivity));
            StartActivity(toMain);
            break;
        case 2:
            Intent toSearch = new Intent(this, typeof(SearchActivity));
            StartActivity(toSearch);
            break;
        case 3:
            Intent toPhoto = new Intent(this, typeof(ListOfPhotoActivity));
            StartActivity(toPhoto);
            break;
        case 4:
            Intent toGlory = new Intent(this, typeof(GloryActivity));
            StartActivity(toGlory);
            break;
        case 5:
            Intent toUser = new Intent(this, typeof(UserActivity));
            StartActivity(toUser);
            break;
    }
}

但它在case数字上强调了我，并写道需要一个常数值。怎么修？

在此处输入图像描述

android

4 个回答

  1. 您需要为每个按钮分配一个 Id，并在 switch() 构造中，按 id 查找视图元素。例如：

         switch(sendBtn.getId()){
case R.id.btn1:
...
case R.id.btn2:
...}

    如果这不适合你的编程语言，我希望我的回答能给你一个关于如何解决这个问题的提示。祝你好运）

    • 3
  2. Best Answer

    无论您在 xml 中写入什么，任何值都将被打包到 Tag 属性中（Tag 仍然是一个对象）。当你请求一个属性时，你总会收到一个对象，所以你需要解包：

    switch ((int) sendBtn.Tag)
    • 1

  3. XAML

    `<Button x:Name="But_01" BindingContext="01" Clicked="Button_Click />" 
 <Button x:Name="But_02" BindingContext="02" Clicked="Button_Click />"`

    XAML.CS

    `private void Button_Click (object sender, EventArgs e)
{
    Button btn = (Button)sender;
    String name_button = Convert.ToString(btn.BindingContext);
    switch (name_button)
    {
        case "01":
            //Нажата кнопка 01
            break;
        case "02":
            //Нажата кнопка 02
            break;
    }
}`
    • 1

  4. 为什么会出现所有这些情况？您还可以为每个按钮创建单独的事件。像这样：

    protected override void OnCreate(Bundle savedInstanceState)
{
  base.OnCreate(savedInstanceState);

  SetTheme(Android.Resource.Style.ThemeDeviceDefaultLightNoActionBar);
  SetContentView(Resource.Layout.MainScreen);

  Button BtnHm = (Button)FindViewById(Resource.Id.Home);
  BtnHm.Click += SwitchActivityByHm;

  Button BtnSrch = (Button)FindViewById(Resource.Id.Search);
  BtnSrch.Click += SwitchActivityBySrch;

  Button BtnLstOfPh = (Button)FindViewById(Resource.Id.ListOfPhotos);
  BtnLstOfPh.Click += SwitchActivityByLstOfPh;

  Button BtnGlr = (Button)FindViewById(Resource.Id.Glory);
  BtnGlr.Click += SwitchActivityByGlr;

  Button BtnMyAcc = (Button)FindViewById(Resource.Id.MyAcc);
  BtnMyAcc.Click += SwitchActivityByMyAcc;
}

public void SwitchActivityByHm(object sender, EventArgs e)
{
  Intent toMain = new Intent(this, typeof(MainScreenActivity));
  StartActivity(toMain);
}

public void SwitchActivityBySrch(object sender, EventArgs e)
{
  Intent toSearch = new Intent(this, typeof(SearchActivity));
  StartActivity(toSearch);
}

public void SwitchActivityByLstOfPh(object sender, EventArgs e)
{
  Intent toPhoto = new Intent(this, typeof(ListOfPhotoActivity));
  StartActivity(toPhoto);
}

public void SwitchActivityByGlr(object sender, EventArgs e)
{
  Intent toGlory = new Intent(this, typeof(GloryActivity));
  StartActivity(toGlory);
}

public void SwitchActivityByMyAcc(object sender, EventArgs e)
{
  Intent toUser = new Intent(this, typeof(UserActivity));
  StartActivity(toUser);
}
    • 0

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